摘要
基于计算流体力学软件Fluent对不同角部形状的矩形高层建筑进行三维数值风场模拟。首先,选用三种不同的湍流模型Realizable k-ε,RNG k-ε及雷诺应力模型(RSM),对矩形截面标准高层建筑进行数值模拟。结果表明,与风洞试验结果对比,除了分离区等流动复杂的区域外,数值模拟能够较好地反映风压分布状况。其中,雷诺应力模型由于考虑湍流各向异性的影响,与试验结果最为接近。其次,对同尺寸下的切角及倒角高层建筑进行雷诺应力湍流模型下的数值模拟。结果表明,角部处理能有效地减小风荷载。在侧风面,切角与倒角能有效抑制来流分离。在背风面,切角能减小尾流宽度与旋涡尺寸,与原模型相比,风荷载约降低15%;而倒角建筑由于较好的流线性,尾流宽度与旋涡尺寸降到最小,风荷载仅为矩形截面的65%。
High buildings with different corner shapes are numerical simulated based on the CFD(computational fluid dynamics)software FLUENT.Firstly,a standard high building is numerical simulated by using three different turbulence models,Realizablekε,RNGkεand Reynolds stress model.By comparing with the results from a windtunnel test,the numerical results are proved to be in good agreements with experimental results except from the separation regions.Reynolds stress model can greatly simulate the complex flow near the wall for the flow anisotropy hypothesis.Then,two samesized buildings but with chamfered and rounded corners are numerical simulated with Reynolds stress model.Results show that wind loads tend to decrease because of corner modification.the shear layers separated from the chamfered and rounded corners approach the side surface.While wind pressures on leeward face of chamfer and roundcornered models reduce by15%and35%respectively due to the reduction of wake width and vortex size.
作者
郑毅敏
庄翔
郑晓芬
董欣
ZHENG Yimin;ZHUANG Xiang;ZHENG Xiaofen;DONG Xin(Department of Structural Engineering,Tongi University, Shanghai 200092, China;Tongi Architectural Design ( Group) Co.,Ltd., Shanghai 200092,China)
出处
《结构工程师》
北大核心
2017年第5期118-124,共7页
Structural Engineers
基金
上海市青年科技启明星计划(15QB1404800)
关键词
数值模拟
高层建筑
切角
圆角
风荷载
numerical simulation
tall buildings
chamfered corner
rounded corner
wind load
